Free WGCTA Practice Questions

Question 1

Ten pairs of bus routes with similar length, ridership, and prior travel times were formed. In each pair, one route was randomly assigned a bus-only lane and the other continued unchanged. After six weeks, the bus-lane route had a larger decrease in average travel time in eight pairs, a smaller decrease in one pair, and the same change in one pair. Which inference is probably true rather than certain?

Accepted Answer

Under conditions like those tested, bus-only lanes tend to reduce travel time.

Answer

Bus-only lanes will reduce travel time on every route.

Answer

The unchanged routes caused delays on the bus-lane routes.

Answer

The results prove that bus lanes are the only factor that can reduce travel time.

Question 2

A clinic reports that most missed appointments occur because patients forget the date. It proposes sending a text reminder 24 hours before every appointment to reduce missed visits. Which unstated assumption is required by the proposal's stated reasoning?

Accepted Answer

At least some patients who might forget can receive and act on the reminder.

Answer

Every patient owns a smartphone, maintains mobile service, and reads each message immediately after it arrives.

Answer

Text messages cost less than calls, letters, or emails in every circumstance.

Answer

No patient ever misses an appointment because of illness, transport problems, work, or family responsibilities.

Question 3

Every project that uses personal data is placed in the ethics-reviewed category. Every ethics-reviewed project has written approval before recruitment begins. Project K began recruitment before written approval was obtained. What can be established about Project K?

Accepted Answer

It did not use personal data.

Answer

Its written approval was issued immediately after recruitment began.

Answer

It belongs to the ethics-reviewed category despite the late approval.

Answer

Every project with written approval uses personal data.

Question 4

Two plants report recordable incidents for the same year. Plant A had 18 incidents during 900,000 work-hours; Plant B had 12 incidents during 400,000 work-hours. Management wants to compare safety performance fairly. Which conclusion is warranted?

Accepted Answer

Plant B had the higher incident rate despite the lower incident count.

Answer

Plant A performed worse because it recorded six more incidents.

Answer

Both plants performed identically because each reported fewer than 20 incidents.

Answer

The plants cannot be compared unless they report exactly the same number of work-hours.

Question 5

At a warehouse, automatic evacuation is required when either two independent sensors each exceed 50 ppm or any one sensor exceeds 80 ppm. When readings conflict, site procedure permits temporary isolation of the affected zone while the discrepancy is investigated. A fixed sensor reads 62 ppm, a second fixed sensor reads 19 ppm, and a calibrated handheld monitor reads 21 ppm; the 62-ppm sensor failed calibration twice this week. Which recommendation is best supported?

Accepted Answer

Keep the zone isolated and inspect the suspect sensor; the evacuation threshold is not met.

Answer

Ignore the alert and continue normal work because two readings are low.

Answer

Evacuate the entire warehouse immediately because any single reading above 50 ppm triggers evacuation.

Answer

Delay inspection until the suspect sensor itself exceeds 80 ppm on a later reading.

Question 6

A laboratory reviewed 14 freezer alarms. Engineers attributed nine to a faulty door sensor, three to brief power interruptions, and left two unexplained. No stored samples were reported damaged. Which inference cannot be decided from these facts?

Accepted Answer

The two unexplained alarms involved no temperature rise.

Answer

Most alarms had an identified cause.

Answer

At least two alarms remained unexplained.

Answer

Some of the reviewed alarms were linked to brief power interruptions.

Question 7

Badge-swipe totals have been adjusted for team size and scheduled workdays. A director says, "Teams with more office entries collaborate more, so adjusted badge-swipe totals should be used as the company's collaboration score." Which assumption is being made?

Accepted Answer

Office-entry frequency is a sufficiently valid indicator of collaboration for the proposed score.

Answer

All meaningful collaboration, including digital collaboration, occurs only inside the office.

Answer

Employees generally prefer office work to remote work.

Answer

The badge system records every office entry perfectly and never misses, duplicates, or misattributes a swipe.

Question 8

Some project assistants are certified mediators. All certified mediators are trained negotiators. No trained negotiator is an intern. What must be true?

Accepted Answer

At least one project assistant is not an intern.

Answer

Every project assistant, whether certified or not, is a trained negotiator.

Answer

Some interns are certified mediators.

Answer

No project assistant is an intern.

Question 9

A screening questionnaire gives nearly identical scores when the same employees complete it one week apart under similar conditions. However, the scores show no meaningful relationship with independently observed job performance, which the questionnaire is intended to predict. How should this evidence be interpreted?

Accepted Answer

The questionnaire appears reliable, but evidence for the intended validity is weak.

Answer

The questionnaire is valid because its scores remain stable across repeated administrations.

Answer

The questionnaire is neither reliable nor valid because prediction is imperfect.

Answer

The questionnaire is valid but probably too difficult for the employees.

Question 10

A retailer must estimate demand for a new service among its current customers. Four teams submit evidence. Which submission should carry the greatest weight?

Accepted Answer

A random customer-list sample gets 81% response and discloses its questions and weighting method.

Answer

A celebrity entrepreneur predicts strong demand from experience in a different industry.

Answer

An 18,000-response social-media poll recruits volunteers who already follow the service's heavily promoted launch campaign.

Answer

A sales manager selects twelve enthusiastic customer emails received after the announcement.

Free WGCTA Practice Questions

Domain 1: Drawing Inferences

Question 1

Question 2

Domain 2: Recognising Assumptions

Question 3

Question 4

Domain 3: Deducing

Question 5

Question 6

Domain 4: Interpreting

Question 7

Question 8

Domain 5: Evaluating Arguments

Question 9

Question 10

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